Study of hydration during curing of residues from coal combustion with limestone addition

被引:17
作者
Anthony, EJ
Iribarne, AP
Iribarne, JV
机构
[1] CANMET, Natural Resources Canada, Ottawa, ON, K1A 0E4
[2] University of Toronto, Toronto, ON
来源
JOURNAL OF ENERGY RESOURCES TECHNOLOGY-TRANSACTIONS OF THE ASME | 1997年 / 119卷 / 02期
关键词
D O I
10.1115/1.2794981
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
The hydration reactions that occur with CFBC materials treated via the CERCHAR hydration process and combined with PFA have been examined and compared with materials produced via the LIFAC (limestone injection into the furnace and activation of unreacted calcium) process. A wide range of chemical and physical techniques have been used to differentiate the actual speciation of cubes treated for up to 150 days. The two materials behave very differently, with FBC-derived ashes being dominated by sulphate chemistry, i.e., the formation of gypsum and ettringite. The CERCHAR-treated ashes appear to ''make'' portlandite available for ''sulpho-pozzolanic'' reactions, and this seems to be the key to understanding why these materials display superior performance in applications with PFA or cement substitution. The LIFAC materials, with much less sulphate and Fe2O3 and more Al2O3, still produces ettringite, but no gypsum, and hydrated tetracalcium aluminate appears as the major hydration product.
引用
收藏
页码:89 / 95
页数:7
相关论文
共 7 条
[1]  
BLAND AE, 1993, 12 ASME FLUID BED CO, P835
[2]  
BLONDIN J, 1993, 12 INT C FBC ASME MA, P827
[3]   STUDIES ON 4CAO.AL2O3.13H2O AND THE RELATED NATURAL MINERAL HYDROCALUMITE [J].
BUTTLER, FG ;
GLASSER, LSD ;
TAYLOR, HFW .
JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 1959, 42 (03) :121-126
[4]  
*GRAC DEARB INC, 1993, EV GEOT BEH CERCHAR
[5]   THE PHASE-ANALYSIS OF COAL COMBUSTION ASHES [J].
IRIBARNE, AP ;
IRIBARNE, JV ;
ANTHONY, EJ ;
BLONDIN, J .
JOURNAL OF ENERGY RESOURCES TECHNOLOGY-TRANSACTIONS OF THE ASME, 1994, 116 (04) :278-286
[6]  
IRIBARNE AP, 1993, 12 INT C FBC ASME MA, P641
[7]  
TAYLOR HFW, 1990, CEMENT CHEM, P475